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  <div class="section" id="module-altgraph">
<span id="altgraph-a-python-graph-library"></span><h1><a class="reference internal" href="#module-altgraph" title="altgraph: A directional graph for python"><tt class="xref py py-mod docutils literal"><span class="pre">altgraph</span></tt></a> &#8212; A Python Graph Library<a class="headerlink" href="#module-altgraph" title="Permalink to this headline">¶</a></h1>
<p>altgraph is a fork of <a class="reference external" href="http://pygraphlib.sourceforge.net">graphlib</a> tailored
to use newer Python 2.3+ features, including additional support used by the
py2app suite (modulegraph and macholib, specifically).</p>
<p>altgraph is a python based graph (network) representation and manipulation package.
It has started out as an extension to the <a class="reference external" href="http://www.ece.arizona.edu/~denny/python_nest/graph_lib_1.0.1.html">graph_lib module</a>
written by Nathan Denny it has been significantly optimized and expanded.</p>
<p>The <a class="reference internal" href="graph.html#altgraph.Graph.Graph" title="altgraph.Graph.Graph"><tt class="xref py py-class docutils literal"><span class="pre">altgraph.Graph.Graph</span></tt></a> class is loosely modeled after the <a class="reference external" href="http://www.algorithmic-solutions.com/enleda.htm">LEDA</a>
(Library of Efficient Datatypes)  representation. The library
includes methods for constructing graphs, BFS and DFS traversals,
topological sort, finding connected components, shortest paths as well as a number
graph statistics functions. The library can also visualize graphs
via <a class="reference external" href="http://www.research.att.com/sw/tools/graphviz/">graphviz</a>.</p>
<dl class="exception">
<dt id="altgraph.GraphError">
<em class="property">exception </em><tt class="descclassname">altgraph.</tt><tt class="descname">GraphError</tt><a class="headerlink" href="#altgraph.GraphError" title="Permalink to this definition">¶</a></dt>
<dd><p>Exception raised when methods are called with bad values of
an inconsistent state.</p>
</dd></dl>

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